System and a method for controlling a module of an optical device intended to be used by a user. The system comprises an optical device and a controller, the optical device is intended to be used by a user, and comprises a first sensor, a second sensor and a module. The controller is configured to determine a situation of the user, using a model and first data received from the first sensor and to determine a confidence level associated with the situation. When the confidence level is below a threshold the controller is also configured to activate the second sensor and to update the situation using second data received from the second sensor. The controller is also configured to control the module according to the situation.